Heat-recuperator for cement-kilns.



No. 812,786. PATENTED FEB. 13,- 1906.

c. ELLIS. v

HEAT REGUPERATOR FOR CEMENT KILNS. APPLICATION FILED um-11, i905.

UNITED srArns PATENT orrion.

OARLET N ELLIS, OF NEW f YORK.

or NEW YORK, N. Y., A CORPORATION OF UTILITIES COMPANY,

NEW YORK.

Original application filed April 18, 1905, Serial No. 256,246. Divided and this application filed August 11,

To all whom it may concern.-

Be it known that I,'CARLETON ELL1s,a citi zen of the United States, and a resident of New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Heat- Recuperators for Cement-Kilns, of which the following is a specification.

This invention relates toapparatus for the continuous regeneration or recuperation of a portion of the sensible heat which is now lost at the stack in the manufacture of Portlandcement clinker by the rotar -kiln process. As is well known, the gases saving the upper part of the rotary kiln are at a high temperature and carry in the form of sensible heat a large portion of the heat generated by the fuel. v

It is the object of this invention to recover a large portion of the heat ordinarily lost in this manner by means of recuperative devices of such a character that they need not beintroduced into or'form a part of the housing of the kiln. but unlike such apparatus are so constructed as to have no retarding influence upon the draftof the kiln.

In the accompanying diagrammatic drawing a form of continuous recuperator is shown which I now regard as the best of the various forms in which this invention may be embodied. The drawing illustrates in section a rotary kiln with a heat-recuperator and other accessories.

Referring to th drawing, 1 is a rotary kiln having the housing 2, stack 3, the header 4, roll rs 5, and rotating mechanism 6.

7 is a pipe delivering fuel to the kiln. In

'the resent instance it is shown connected to a gas-producer 8, the fuel used for burning the cement, as illustrated, being producergas.

9 is a bustle-pipe surrounding the pipe 7 and housing for the admission of air to support combustion, although the admission of air is not necessarily confined to this'point and air may be admitted through the clinkerdischarge opening or otherwise.

10 is a passage having inlet 11 into the housing of the kiln. Through this passage the int nsely-heated products of combustion are drawn by means of the fan 12. In thls passage is placed the pipe or fine 15, in which is an air-inlet 16 near the upper end of the Specification of Letters Patent.

N. Y., ASSIGNOR TO oonsusrron' HEAT-RECUPERATOR FOR CEMENT-KILNS.

Patented Feb. 13, 1906.

1905. Serial No. 273,845.

kiln. A fan 18 serves todraw air through the passage and propel it through the passage 19 into the kiln.

13 is an exhaust-pipe for the fan 12.

14 is a pipe extending from the fan to the gas-producer, so arranged that products of combustion and air may be admitted to the producer to generate combustible gas.

The fan 20 delivers fresh air to the pipe 1% through the pipe 21. Dampers or valves 22, 23, 24, and serve to regulate'the flow of the gases or air employed in the operation of this apparatus.

My method of operation of the illustrated apparatus is as follows: Products of combustion from the kiln 1 pass into the housing 2 heating the latter to a high temperature, an ordinarily depart through they stack,3. A. portion of the products'of combustion or all the stack gas, if desired, may be drawn through the aperture 1 Lintti the recuperator 10 by means of the fan 12 At the same time air is drawn through. the inlet 16 into the fine 15. As it traverses the horizontal portion of the flue 15 it becomes highly heated. It is then delivered to the kiln in such amount as is necessary to efiect com plete and intense combustion. The products of combustion traverse the passage 10 and are cooled by the air passingthrough 15 and may be taken and delivered to the producer 8 in such amount as may be needed for the operation of gas-making, it bein understood that suf ficient carbon dioXid 18 used to control the temperature of the producer and prevent the slagging or cindering of the fuel. Steam, of course, may be used for the same purpose, although it is not as desirable. The fan 20 permits of the introduction of fresh air in sufficient amount to form a blast mixture of the requisite composition. Such quantities of pipe 13. By above mentioned the flow of gases and the control of combustion inthe kiln and in the producer maybe properl' made. The air may be forced through t .e recu erator by placing the fan at the o posite en way the fan may hand e cool air and is less liable to injury than when situated where \heated. air is handled. The flow of gases the products of combustion as are not needed in the producer are discharged through the regulating the various dampers In that from kiln 1 through housing 2 to stack 2 being in one direction, while that from the housing to and through the auxiliaryflue 'isin a contrary direction, there is an intermediate neutral or uieting zone between the two flows where ust tends to deposit.

What I claim is 1. In a cement-making apparatus, the combination of a kiln, a fuel-,burner for one end of the kiln, a dust-collecting housing for the other end of the kiln, a chimney-stack connected to and removing waste gases from the housing, an auxiliary 'l'luealso connected to dust-settling zone is created between the two lines of flow;

2. In a cement-making apparatus, a gasfired kiln, a gas producer supplying gas there to, a housing for the upper end of the kiln, a chimney-stack removing waste gases from the housing, an auxiliary flue also connected to the housing for abstracting a portion of waste gases therefrom, a surface air-heater contained in the flue, power-driven means for inducing and controlling a flow of Waste gases through the flue and thereby regulating the heating of the air, a pipe connection from the heater delivering heated air into the gasfired end of the kiln, and apipc connection ..delivering cooled waste gases from the flue into the gas-producer.

3. In a cement-making apparatus, an inclined rotary gas-fired kiln, a gas-producer supplying gas to the kiln, a dust-collecting housing for the upper end of the kiln, a chiinney-staok removing waste gases from the housing, an auxiliary flue also connected to the housing for abstracting a portion of the waste gases therefrom, a surface air-heater contained in the flue, power-driven means for inducing and controlling a How of Waste gases through the flue and thereby regulating the heating of the air, a pipe connection between the heater and the gas-burner of the kiln, and a pipe connection abstracting a portion of the cooled waste gases from the line and delivering the same into the gas-pro ducer.

Signed at New York city, in the county of. v

New York and State of New York, this 22d day of June, A. D. 1905. i

' CARLETQN ELLIS.

Witnesses J AS. K. CLARK, A. M. SENIOR. 

